Planer-platen guideway and bearing



C. M. CONRADSON.

PLANE-IR PLATEN GUIDEWAY AND BEARING. APPLICATION FILED OCT. 2.1319.

1,367,802. Patented Feb. 8,1921.

UNITED STATES PATENT OFFICE.

CONRAD M. CONRAIDSON, OF MADISON, WISCONSIN.

PLANER-PLATEN GUIDEWAY AND BEARING.

Application filed October 2, 1919.

T all 10]! am it may concern Be it known that I, CONRAD M. CONRAD- SON,a citizen of the United States, resident of Madison, county of Dane,State of 71sconsin, have invented certain new and useful Improvements inPlaner-Platen Guideways and Bearings, of which the following is aspecification.

The guideways for planer tables, ptlIiJlClb larly of the heavy dutytype, are subjected to incessant friction under heavy pressure, directedespecially in a downward direction. As ordinarily constructed in thecross section form of an inverted V, the downwardly slanting sides ofthe guide-ways induce the lubricating oil to run downward and escapefrom the bearing surfaces, thus destroying the oil film between thesurfaces and resulting in excessive friction, increase in powernecessary to drive the planer and inordinate wear on the guideways.Furthermore, the bearing surfaces of these guideways are necessarily, bythe pyramidical form of their cross section, limited in area to preventexcessive height and weight of the platen and the general lack ofsufficient bearing surface further increases the wear due to faultylubrication.

The object of the invention is, therefore, to form the planer guidewayswith a large bearing area particularly effective for pressure in adownward direction and provide the guideways with a lateral bearingsurface of a lesser area, while, at the same time, constructing theguideways in such a manner that the lubricating oil is conserved on thebearing surfaces to form a constant oil film between the slidingsurfaces especially between those subjected to the greater verticalpressure.

A further object is to construct the planer frame and platen in acompact, rigid and cheaply machined form.

By these improvements I greatly increase the efficiency, economy anddurability of the machine as heavier cuts may be taken with cuttingtools, greater speeds of the reciprocating platen may be obtained andproportionately less power needed for a given amount of work to beaccomplished.

My invention consists in certain constructions and combinations as setforth in the following detailed description and particularly pointed outin the claims.

In the accompanying drawings forming part of this specification,

Specification of Letters Patent.

Patented Feb. 8, 1921.

Serial No. 328,011.

I Figure 1 is a perspective view of a planmg machine having my inventionapplied thereto,

Fig. 2 is a vertical transverse section of the machine frame and platen,showing the preferable form of the guideways and also the gear forreciprocating the platen.

In the drawing, 3 represents the planer bed or main frame of the usualbox type and having the side and upper housings 4, partly shown in Fig.2. The top of the box-like frame structure is preferably closed theentire length of the machine by concave topplate 5 cast integrally withthe side and end walls of the frame and having ribs 6 runninglongitudinally from end to endof the main frame. These ribs are spaced apreferred distance from each other as shown, and their outer sides areaccurately finished at an upwardly converging angle of approximately 15degrees from the vertical to form the lateral guideways 7. At the pointswhere the guide-ways 7 join the top plate 5, horizontal bearing surfaces8 are machined on the plate and diverge outwardly and upwardly from theguideways' at an angle of substantially ninety degrees from the ways orapproximately 15 degrees from the horizontal to form the guide-ways 7The bearing surfaces 8 are of much greater area than the guideways 7 andat the points of intersection I prefer to provide a slight undercut 9for the purpose of proper lubrication. Longitudinal ribs 10 project fromthe outer extremity of the bearing surfaces to about the same height asthe guideway ribs 6 and running parallel with said ribs form a troughfor the reception of lubricating oil and prevent the lubricant fromescaping from the bearing surfaces 7 and 8. An opening 11 is provided inthe top plate 5 through which a driving bull. gear 12, mounted looselyon a shaft 13, projects to reciprocate the planer table or platen bymeans of a rack 15.

The platen 11 is a hollow rectangular casting, consisting of the uppertable plate 16 having the usual slots 17 for receiving the clampingbolts to hold the work to the table, the side walls 18 and 19 and thebottom plate 20, to which latter the rack is secured. A central rib 21is preferably arranged above the rack, joining the bottom plate andtable plate 16 together for the purpose of providing positive rigidityto the platen.

on the bearing surfaces 8 and lateral movement of the platen isprevented by the guideways 7, slightly aided by the diverging angle ofthe bearing surfaces 8.

It Wlll be noted that as the platen is re ciprocated the maximumpressure and wear of the work is transferred to the broad area of thebearing surfaces 8, and that any occurring minimum lateral pressure issub stantially absorbed by the smaller lateral guideways 7. It will alsobe noted that the peculiar rigidity of this. construction renders themachine particularly adapted for heavy,accurate work and that thelubricant will not tend to escape from the sliding surfaces, but onaccount of the slight inward and downward angle of the bearing surfaces8 will tend to flow downward toward the guideways T. The face of thesebeing con1- paratively low will be constantly lubricated from thesiiirplus oil collecting in the undercut grooves 9, from which oil willbe spread to both the bearing and guiding surfaces.

It will be understood that the exact construction shown and described asto the degrees of angles and other details may be varied without deiarting from the principle and scope of the invention, and I do not,therefore, wish to confine myself strictly to the construction as shown.

I claim as my invention:

1. A machine bed having oppositely dis posed correspondingly formedguides, the bottoms of said guides being slightly inclined inwardly anddownwardly from the horizontal, the side surfaces of said guides beinginclined inwardly and upwardly from the vertical, and a carriage havingcome spondingly shaped ribs to fit the surfaces of said guides. V

2. A machine bed having oppositely disposed correspondingly formedguides, the bottoms of said guides being slightly in clined inwardly anddownwardly from the horizontal, the side surfaces of said guides beinginclined inwardly and upwardly from the vertical, and a carriage havingcorrespondingly shaped ribs to fit the surfaces of said guides, thebottoms of said guides and ribs being of greater area than the sidesurfaces thereof.

8. A machine bed having oppositely disposed correspondingly formedguides and a. carriage having ribs correspondingly shaped to fit saidguides, said guides and ribs having lower surfaces inclined slightly tothe horizontal and lateral surfaces intersecting said lower surfaces andinclined slightly to the vertical.

4. A machine bed having oppositely disposed, correspondingly formedguides and a carriage having ribs correspondingly shaped to fit saidguides,-said guides and. ribs having lower surfaces inclined slightly tothe' horizontal and lateral surfaces intersecting said lower surfacesand inclined slightly to the vertical, and means for maintaining aconstant lubricating film on said surfaces.

In witness whereof, I have hereunto set my hand this 19th day ofSeptember, 1919.

CONRAD M. CONRADSON. lVitncss:

ALTOE M. I-IAWLEY.

